docs: def get_style_defs(self, arg=''):
          """
          Return the command sequences needed to define the commands
          used to format text in the verbatim environment. ``arg`` is ignored.
          """
          cp = self.commandprefix
          styles = []
          for name, definition in iteritems(self.cmd2def):
              styles.append(r'\expandafter\def\csname %s@tok@%s\endcsname{%s}' %
                            (cp, name, definition))
          return STYLE_TEMPLATE % {'cp': self.commandprefix,
                                   'styles': '\n'.join(styles)}